package redcoder.texteditor.core.tabpane;

import javax.swing.*;
import javax.swing.plaf.basic.BasicButtonUI;
import java.awt.*;
import java.awt.event.*;

/**
 * Component to be used as tabComponent;
 * Contains a JLabel to show the text and
 * a JButton to close the tab it belongs to
 */
public class ButtonTabComponent extends JPanel {

    private final TabPane tabPane;
    private final JLabel label;

    public ButtonTabComponent(TabPane tabPane, String title) {
        // unset default FlowLayout' gaps
        super(new FlowLayout(FlowLayout.LEFT, 0, 0));
        this.tabPane = tabPane;
        setOpaque(false);

        label = new JLabel(title);
        label.setFont(new Font(null, Font.PLAIN, 20));
        add(label);
        //  add more space between the label and the button
        label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));

        //  tab button
        JButton button = new TabButton();
        add(button);
        //  add more space to the top of the component
        setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
    }

    public void updateTabbedTitle(String newTitle) {
        label.setText(newTitle);
    }

    private class TabButton extends JButton implements ActionListener {
        public TabButton() {
            int size = 18;
            setPreferredSize(new Dimension(size, size));
            setToolTipText("close this tab");
            // Make the button looks the same for all Laf's
            setUI(new BasicButtonUI());
            // Make it transparent
            setContentAreaFilled(false);
            // No need to be focusable
            setFocusable(false);
            setBorder(BorderFactory.createEtchedBorder());
            setBorderPainted(false);
            // Making nice rollover effect
            // we use the same listener for all buttons
            addMouseListener(buttonMouseListener);
            setRolloverEnabled(true);
            // Close the proper tab by clicking the button
            addActionListener(this);
        }

        public void actionPerformed(ActionEvent e) {
            int index = tabPane.indexOfTabComponent(ButtonTabComponent.this);
            if (index != -1) {
                tabPane.closeTab(index);
            }
        }

        //  we don't want to update UI for this button
        public void updateUI() {
        }

        //  paint the cross
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g.create();
            // shift the image for pressed buttons
            if (getModel().isPressed()) {
                g2.translate(1, 1);
            }
            g2.setStroke(new BasicStroke(2));
            g2.setColor(Color.BLACK);
            if (getModel().isRollover()) {
                g2.setColor(Color.MAGENTA);
            }
            int delta = 6;
            g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
            g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
            g2.dispose();
        }
    }

    private final static MouseListener buttonMouseListener = new MouseAdapter() {
        public void mouseEntered(MouseEvent e) {
            Component component = e.getComponent();
            if (component instanceof AbstractButton) {
                AbstractButton button = (AbstractButton) component;
                button.setBorderPainted(true);
            }
        }

        public void mouseExited(MouseEvent e) {
            Component component = e.getComponent();
            if (component instanceof AbstractButton) {
                AbstractButton button = (AbstractButton) component;
                button.setBorderPainted(false);
            }
        }
    };
}

